She's ecstaticly happy and over joyed that he died to save her but she feels rotten about surviving under those terms and feeling good about it.

I don't see her being ecstatically happy about anything. She's glad she's alive, but wishes it were her and not Daniel who died. She feels responsible on many levels, not just the accidental human shield issue. She tried to connect with him and he felt age with her, hence why hiding under her bed seemed like the best place for him to go.

The biggest thing that she probably blames herself for is that of she hadn't had all of the personal crap in her life, she wouldn't have tried to dig so deeply in her work and desire to prove herself to Will and Mac, if she hadn't hidden a report on the increased danger in the region, if she hasn't insisted on going, Daniel might still be alive.

That's what I took away from the episode.

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